Rang me 6 times over 2 days while I was interstate did not leave a message

Caller said he was feom telstra - i receive 4 or 5 calls a week - why telstra can't block these scam callers????????????

asked me to enter speedtest.net into google search. the address bar showed not secure in front of address and when i told him he hung up on me

Caller: Internet Scam

Called regarding speed of Internet and asked what was on the screen, simple it says
SCAM you poorly spoken Overseas Scammer.

Caller: supossedly from telstra nbn

wanted me to do Telstra speed check which I did then asked me to type TEAMVIEWER in google wasn't keen on that so terminated call ,,,didn't know the number she was calling from as Telstra usually come through on a number I know